On Tuesday, there will be sunny intervals at first before thicker clouds gather from the west. In the afternoon, there will be intermittent precipitation in the Jura, with the snowfall level rising to around 1500 m. Winds will become increasingly strong from the southwest, with a strong foehn wind in the north.
Small snowdrift accumulations will form locally, resulting in a slight increase in avalanche risk.
Precipitation will set in from the west and south overnight to Wednesday. On Wednesday, it will be mostly very cloudy with widespread rain or snow. The snowfall level will drop gradually from around 1500 m down to low altitudes. Along the Main Alpine Ridge and south of there, 15 to 30 cm of snowfall are expected. There will be a strong southerly wind overnight, which will ease during the day and veer to the north.
Fresh snow and wind will create snowdrift accumulations that are prone to triggering. There will be a widespread increase in avalanche risk.
", "valid_from": null, "valid_until": null, "tendency_type": null}], "tendency_lead": null, "weather_review": "Snow fell overnight in the south down to low altitudes. During the day conditions remained overcast in the south, while there was broken cloud in the north and a little snow fell in the east.
From Friday evening to Sunday evening, the following amounts fell above approximately 1300 m:
At midday at 2000 m, around -5\u00b0C
South to southwesterly
In the north, there will be broken to heavy cloud cover with a little snow falling down to low altitudes. In the west and in the inneralpine regions there will be some quite sunny intervals over the course of the day, with moderate northerly winds on the southern flank of the Alps.
At midday at 2000 m, between -7\u00b0C in the north and -3\u00b0C in the south
The fresh snow in the south and the snowdrift accumulations formed by the southerly winds are lying on a very weak old snowpack or on surface hoar. The snowdrift accumulations are sometimes covered with fresh snow and are thus hard to identify. Avalanches can be easily triggered at the transition from fresh and drifted snow to old snow.
There are distinct weak layers in the middle and lower part of the snowpack, particularly on wind-protected shady slopes. Such places are particularly common south of a line from the Rhone to the Rhine. Medium-sized and occasionally large avalanches can still be triggered by human activity in these weak layers. The snowpack on northern and eastern slopes in central Valais, as well as in northern Grisons, is most prone to triggering and whumpfing sounds and isolated remote triggering are still being reported in these regions. North of a line from the Rhone to the Rhine, the deeper layers of the snowpack are somewhat less prone to triggering and hazardous zones are less common.
"}, "danger": {"key": "considerable", "number": "3", "ratings": [{"key": "considerable", "period": "all_day", "elevation": null, "subdivision": "-"}], "subdivision": "-"}, "source": "SLF", "traits": [{"prose": null, "title": "Dry avalanches", "band_id": null, "category": "dry", "problems": [{"extras": {"subdivision": "minus", "core_zone_text": "Danger level \"considerable\" (3-) in west to north to east facing aspects above 2200m."}, "aspects": ["N", "NE", "E", "W", "NW"], "elevation": {"lower": 2200, "upper": null, "treeline": false, "treeline_side": null}, "frequency": null, "time_period": "all_day", "comment_html": "As a consequence of southerly wind, avalanche prone wind slabs formed on Sunday in particular in gullies and bowls. The wind slabs are lying on top of a weakly bonded old snowpack. Even single snow sport participants can release avalanches. These can also be triggered in deep layers and reach large size in isolated cases. Remotely triggered avalanches are possible in isolated cases. Whumpfing sounds and the formation of shooting cracks when stepping on the snowpack can indicate the danger.